The snappily named Clover Character Pack adds a whole new class, new melee and ranged weapons, and inevitably a new mask to wear while on the job.
Clover is a burglar, brought up in "a rough house in a rough part of town." That unsavoury upbringing gives her the ability to pick locks, bag bodies and (bizarrely) answer pagers faster. She's also tougher than other classes, able to shrug off otherwise fatal wounds. A new Burglar perk deck allows you to develop her particular skills.
In terms of weaponry, Clover packs a(a big, knobbly wooden stick that every Irish person secretly carries) for melee thwacking, and a L-95 assault rifle for ranged work. For her mask, she's chosen a particularly hideous creation with a "surgically-shrunken nose, the botox’d lips and the expression of all-consuming vanity and self-obsession."
Both theand the Diamond Heist DLC are sold separately, but as its Steam Sale time at the moment you can grab each of them for a 10% discount.